2 * UDPLITE An implementation of the UDP-Lite protocol (RFC 3828).
4 * Authors: Gerrit Renker <gerrit@erg.abdn.ac.uk>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
14 #define pr_fmt(fmt) "UDPLite: " fmt
16 #include <linux/export.h>
19 struct udp_table udplite_table __read_mostly;
20 EXPORT_SYMBOL(udplite_table);
22 /* Designate sk as UDP-Lite socket */
23 static int udplite_sk_init(struct sock *sk)
26 udp_sk(sk)->pcflag = UDPLITE_BIT;
30 static int udplite_rcv(struct sk_buff *skb)
32 return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
35 static void udplite_err(struct sk_buff *skb, u32 info)
37 __udp4_lib_err(skb, info, &udplite_table);
40 static const struct net_protocol udplite_protocol = {
41 .handler = udplite_rcv,
42 .err_handler = udplite_err,
47 struct proto udplite_prot = {
50 .close = udp_lib_close,
51 .connect = ip4_datagram_connect,
52 .disconnect = udp_disconnect,
54 .init = udplite_sk_init,
55 .destroy = udp_destroy_sock,
56 .setsockopt = udp_setsockopt,
57 .getsockopt = udp_getsockopt,
58 .sendmsg = udp_sendmsg,
59 .recvmsg = udp_recvmsg,
60 .sendpage = udp_sendpage,
62 .unhash = udp_lib_unhash,
63 .get_port = udp_v4_get_port,
64 .memory_allocated = &udp_memory_allocated,
65 .sysctl_mem = sysctl_udp_mem,
66 .obj_size = sizeof(struct udp_sock),
67 .h.udp_table = &udplite_table,
69 .compat_setsockopt = compat_udp_setsockopt,
70 .compat_getsockopt = compat_udp_getsockopt,
73 EXPORT_SYMBOL(udplite_prot);
75 static struct inet_protosw udplite4_protosw = {
77 .protocol = IPPROTO_UDPLITE,
78 .prot = &udplite_prot,
79 .ops = &inet_dgram_ops,
80 .flags = INET_PROTOSW_PERMANENT,
85 static const struct file_operations udplite_afinfo_seq_fops = {
90 .release = seq_release_net
93 static struct udp_seq_afinfo udplite4_seq_afinfo = {
96 .udp_table = &udplite_table,
97 .seq_fops = &udplite_afinfo_seq_fops,
99 .show = udp4_seq_show,
103 static int __net_init udplite4_proc_init_net(struct net *net)
105 return udp_proc_register(net, &udplite4_seq_afinfo);
108 static void __net_exit udplite4_proc_exit_net(struct net *net)
110 udp_proc_unregister(net, &udplite4_seq_afinfo);
113 static struct pernet_operations udplite4_net_ops = {
114 .init = udplite4_proc_init_net,
115 .exit = udplite4_proc_exit_net,
118 static __init int udplite4_proc_init(void)
120 return register_pernet_subsys(&udplite4_net_ops);
123 static inline int udplite4_proc_init(void)
129 void __init udplite4_register(void)
131 udp_table_init(&udplite_table, "UDP-Lite");
132 if (proto_register(&udplite_prot, 1))
133 goto out_register_err;
135 if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
136 goto out_unregister_proto;
138 inet_register_protosw(&udplite4_protosw);
140 if (udplite4_proc_init())
141 pr_err("%s: Cannot register /proc!\n", __func__);
144 out_unregister_proto:
145 proto_unregister(&udplite_prot);
147 pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__);